Process of producing combined dies and counterdies for swaging seamless gold crowns



PROCESS OF PRODUCING COMBINED DIES AND COUNTERDIES FOR SWAGING SEAMLESS GOLD CROWNS. APPLICATION man AUG. 15, I921.

1,420,940. Patented June.27, 1922.

i INVENTOR I wk TTORNEY sire FEFEQE,

F AT

EINOS'UKE ONO, OF HIRAKA-G-UN, AKITA-KEN, JAPAN.

PROCESS OF PRODUCING COMBINED DIES AND COUNTER-DIES FOR SWAGING SEAMLESS GOLD CROWN'S.

rezoned Specification of Letters Patent.

Patented June 2'7, 1922.

Application filed August 15, 1921. Serial No. 492,360.

To all whom it may concern:

Be it known that I, Ernosonn ONO, a subject of the Emperor of Japan, and a resident of No. 14 Imashuku, Numadate Machi, Hiraka-Gun, Akita-Ken, Empire of Japan, have invented a new and useful Improvement in Processes of Producing Combined Dies and Counterdies for Swaging Seamless Gold Crowns, of which the following is a specification.

This invention relates, generally, to improvements in dental dies and relates more particularly to means and method or process of producing combined die and counter-die for swaging. seamless gold crown, which consists in overlaying upon the surface of either male or female die a coating of separating or spacing compounds to such an ex tent as to form between them a thick film of the thickness substantially equal to the thickness of the seamless gold crown sought to be produced, subsequently pouring thereto a fusible metal so as to cast combined die and counter die having a space corresponding with the thickness of the seamless gold crown to be produced.

Heretofore, swagings have been usually effected by way of either reduced neck system or enlarged head'system, which contemplate the use of either male die or female die independently of each other through the medium of soft rubber, paraffin, clay, saw dust, bullet, etc. This method, however, proved unsatisfactory in view of the fact that it not only produced an incomplete article but at the same time rendered the operation very troublesome.

The present invention, therefore, has for its object to provide a novel and simple process or method of producing a finished and more properly shaped mould which will enable the crown shell to fit tightly upon the teeth as well as the mould.

With the various objects of the present invention in view, the said invention consists, primarily, in the novel dental model or cast hereinafter set forth, and the said invention consists, therefore, in the novel process or methods of producing such dental models or casts.

The invention is clearly illustrated in the accompanying drawings, in which Figure 1 is a sectional view showing the die, the spacing compound thereon, and also showing the counter die in process of construction.

Figure 2 is a similar view showing the die and counter die as in use for swaging a crown.

Similar characters of reference are employed in the said above described views, to indicate corresponding parts.

Referring to the drawings, the reference character 1 indicates a metal die made under ordinary process, the upper surface of which is covered with a layer of separating fluid or spacing compounds, substantially in proportions hereinafter described, in such a manner so as to form a layer 2 of the thickness conforming with the thickness of seamless gold crown to be produced. A fusible metal is then poured over it through a suitable duct so as to cast a die 3, thus producing a desired combined die and counter die having the space 4 corresponding to the thickness of the gold crown to be produced.

The preferred proportions of the materials employed to produce the above men tioned spacing compounds are as follows, although other equivalents may be substituted if desired Chloroform 7 gm. Gutta-percha l gm. Ground stone powder 2 gm.

In practice, the above materials after having been thoroughly mixed may be applied upon the surface of the moulds by means of a suitable brush.

So far as I am aware, combined metal die and counter die has not been known. In the method heretofore used the die and counter die has been used separately and independently, and not in a conjoint manner, which accompanied a great deal of disadvantages as already stated above/ With my combined dies I am enabled to overcome all these inconveniences.

What I claim is A process of producing a die for use in connection with another die for swaging vides a space between the said two dies con- 10 seamless gold crown, which consists in placforming to the thickness of the seamless ing upon the surface of a die a layer of gold crown to be produced.

separating material so as to form a cover- In testimony whereof I affix my signature ing or coating thereon, of a thickness equal in presence of two witnesses.

to the thickness of the seamless gold crown EINOSUKE ONO, to be produced, in pouring it fusible metal Witnesses:

so as to cast another die or counter die, char- EDWARD C. VYNNE,

acterized in that the finished product pro- HARUTADA YASAMORO. 

